关键词: 动态试验；轨迹描绘；喷液法；试验设计

Abstract: Description of vehicle dynamic test trajectory is an important step in vehicle detection.In this paper, based on the analysis of the existing sampling methods to describe the vehicle dynamic test trajectory, a vehicle dynamic trajectory tracing system based on programmable logic controller (PLC) is designed, which using the liquid injection method. The Taguchi method is used to analyze the design parameters, and the influences of nozzle diameter, flow rate of proportional valve and nozzle height on the trajectory width and trajectory blur time are studied when the road surface, test temperature range and vehicle speed have been set. The system has the characteristics of controllable flow rate of jet fluid with the speed, adjustable track line width, instant on and off, simple operation, etc., which brings great convenience and accuracy for the description of vehicle dynamic trajectory

Key words: Dynamic test; Trajectory description; Liquid spraying method; Design of experiment